ZK-502MT 2.0 Bluetooth 2-Channel 50W Amplifier

The ZK-502MT Amplifier Module is a high-quality Digital Audio Amplifier equipped with a built-in Bluetooth receiver. It features two 50W RMS output channels (stereo output or four speaker terminals) and operates on a DC power supply ranging from 12V to 24V.

Using Bluetooth version 5.0, the ZK-502MT 2.0 Bluetooth 2-Channel 50W Amplifier provides a stable wireless connection with an unobstructed range of up to 15 meters and excellent software compatibility. If the input voltage is too low, sound distortion may occur easily. Similarly, if the current is insufficient, the speakers may lower the voltage, resulting in poor sound quality or unstable performance.

The BASS potentiometer in the center controls the low-frequency response — rotating it clockwise increases the bass, while turning it counterclockwise decreases it. When the knob is centered, the bass remains neutral. The TREBLE potentiometer on the left controls the high frequencies — turning it right boosts treble, and turning it left reduces it. When centered, there is no change in treble level.

In addition to Bluetooth connectivity, the ZK-502MT 2.0 Digital Audio Amplifier Module also includes an AUX input, offering flexibility for both wired and wireless connections. The amplifier features volume and equalizer control knobs for fine-tuning speaker output. It is compatible with 4–8Ω speakers, delivering clear, powerful, and well-balanced sound for a variety of audio applications.

Applications of the 2-Channel Amplifier

1. Cell Phones / Tablets
2. Laptop
3. Home Audio Systems
4. Portable Speakers
5. Car Audio System
6. DIY application

Specifications of the Bluetooth Amplifier

1. Bluetooth Version: 5.0 (unobstructed range up to 15 meters)
2. Signal-to-Noise Ratio (SNR): > 90 dB
3. Input Modes: AUX + Bluetooth
4. Channels: 2 (Left and Right Stereo)
5. Supported Speaker Output: 15 ~ 100W, 4 ~ 8 Ω
6. Adjustable Power Supply: DC 9 ~ 24V / 3A or higher (cannot be connected to a 24V battery pack)
7. Protection Mechanisms: Overheat, overcurrent, and short-circuit protection
8. Power Supply vs Output:

• 12V: 8Ω → 12W + 12W, 4Ω → 20W + 20W
• 15V: 8Ω → 18W + 18W, 4Ω → 30W + 30W
• 19V: 8Ω → 30W + 30W, 4Ω → 40W + 40W
• 24V: 8Ω → 40W + 40W, 4Ω → 50W + 50W